<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>Bootstrap 101 Template</title>

    <!-- Bootstrap -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">

    <!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
    <!-- 警告：通过 file:// 协议（就是直接将 html 页面拖拽到浏览器中）访问页面时 Respond.js 不起作用 -->
    <!--[if lt IE 9]>
    <script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
    <![endif]-->
    <link href="//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
</head>
<body>
<h1>导航相关</h1>
<h2>标签页</h2>
<ul class="nav nav-tabs">
    <li role="presentation" class="active"><a href="#">Home</a></li>
    <li role="presentation"><a href="#">Profile</a></li>
    <li role="presentation"><a href="#">Messages</a></li>
</ul>
<h2>胶囊式</h2>
<ul class="nav nav-pills">
    <li role="presentation" class="active"><a href="#">Home</a></li>
    <li role="presentation"><a href="#">Profile</a></li>
    <li role="presentation"><a href="#">Messages</a></li>
</ul>
<h2>下拉式</h2>
<ul class="nav nav-tabs">

    <li role="presentation" class="dropdown">
        <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
            中国 <span class="caret"></span>
        </a>
        <ul class="dropdown-menu">
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
        </ul>
    </li>
    <li role="presentation" class="dropdown">
        <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
            中国 <span class="caret"></span>
        </a>
        <ul class="dropdown-menu">
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
        </ul>
    </li>
    <li role="presentation" class="dropdown">
        <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
            中国 <span class="caret"></span>
        </a>
        <ul class="dropdown-menu">
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
            <li><a href="">曹操</a></li>
        </ul>
    </li>
</ul>
<h1>导航条</h1>
<nav class="navbar navbar-default">
    <div class="container-fluid">
        <div class="navbar-header">
            <a class="navbar-brand" href="#">
                <img alt="Brand" src="3.jpg" style="width: 60px">
            </a>
        </div>
        <ul class="nav navbar-nav">
            <li><a href="">首页</a></li>
            <li><a href="">刘德华</a></li>
            <li><a href="">张学友</a></li>
            <li><a href="">郭富城</a></li>
        </ul>
    </div>
</nav>
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
<script>
    //给所有li添加点击事件
    $("li").click(function () {
        //该点击的元素添加class属性
        $(this).attr("class","active")
        //siblings()获取某个元素的所有兄弟元素
        $(this).siblings().attr("class","")
    })
</script>
</body>
</html>